Optical communication drive circuit and method, optical communication transmitter and system, and vehicle

Abstract

The present disclosure provides an optical communication drive circuit and method, an optical communication transmitter, an optical communication system, and a vehicle. The optical communication drive circuit includes a clock circuit and a modulation circuit. The clock circuit is configured to output a clock signal with an initial frequency signal as an input under control of information to be transmitted. The clock signal includes alternating first and second frequency signals, the first frequency signal and the second frequency signal having different frequencies and being generated based on the initial frequency signal; and the modulation circuit is configured to modulate an optical signal by the clock signal to obtain a modulated optical signal.

What is claimed is: 
     
       1. An optical communication drive circuit, comprising:
 a clock circuit, configured to output a clock signal with an initial frequency signal as an input under control of information to be transmitted, wherein the clock signal comprises alternating first and second frequency signals, the first frequency signal and the second frequency signal having different frequencies and being generated based on the initial frequency signal; and 
 a modulation circuit, configured to modulate an optical signal by the clock signal output by the clock circuit to obtain a modulated optical signal; and 
 the clock circuit comprises:
 a control sub-circuit, configured to generate a sequence of control words according to the information to be transmitted, wherein the sequence of control words comprises alternating first and second control words; and 
 a processing sub-circuit, configured to obtain the first frequency signal based on a frequency of the initial frequency signal and the first control word in the sequence of control words generated by the control sub-circuit, and obtain the second frequency signal based on the frequency of the initial frequency signal and the second control word in the sequence of control words generated by the control sub-circuit; wherein 
 the processing sub-circuit comprises:
 a frequency divider, configured to generate K signals having uniformly spaced phases according to the initial frequency signal, wherein K is an integer greater than 2; and 
 a frequency synthesizer, configured to generate the first frequency signal based on the K signals having uniformly spaced phases generated by the frequency divider and the first control word, and generate the second frequency signal based on the K signals having uniformly spaced phases and the second control word. 
 
 
 
     
     
       2. The optical communication drive circuit according to  claim 1 , wherein the control sub-circuit is configured to sequentially select, based on a corresponding relationship between bits and control words, control words corresponding to respective bits in the information to be transmitted according to an order of the bits in the information to be transmitted, so as to obtain the sequence of control words. 
     
     
       3. The optical communication drive circuit according to  claim 2 , wherein the control sub-circuit is configured to select the corresponding relationship between the bits and the control words according to a communication mode, wherein the corresponding relationship between the bits and the control words is at least partially different in different communication modes. 
     
     
       4. The optical communication drive circuit according to  claim 1 , wherein the frequency synthesizer is configured to generate a first periodic signal and a second periodic signal based on the K signals having uniformly spaced phases and the first control word, and further generate the first frequency signal based on the first periodic signal and the second periodic signal; and generate a third periodic signal and a fourth periodic signal based on the K signals having uniformly spaced phases and the second control word, and further generate the second frequency signal based on the third periodic signal and the fourth periodic signal. 
     
     
       5. The optical communication drive circuit according to  claim 4 , wherein the frequency synthesizer is configured to generate the first periodic signal, the second periodic signal, the third periodic signal, and the fourth periodic signal according to a formula as follows:
 TA=I*Δ, TB=(I+1)*Δ, TC=J*Δ, TD=(J+1)*Δ, wherein Δ represents a phase difference between any two adjacent signals of the K signals having uniformly spaced phases, I represents an integer part in the first control word, J represents an integer part in the second control word, TA represents the first periodic signal, TB represents the second periodic signal, TC represents the third periodic signal, and TD represents the fourth periodic signal. 
 
     
     
       6. The optical communication drive circuit according to  claim 5 , wherein the frequency synthesizer is configured to generate the first frequency signal and the second frequency signal according to a formula as follows:
     TTAF 1=(1− r )* TA+r*TB,TTAF 2=(1− s )* TC+s*TD,  
 
 wherein TTAF1 represents a period of the first frequency signal, r represents a decimal part in the first control word, with 0≤r<1, TTAF2 represents a period of the second frequency signal, and s represents a decimal part in the second control word, with 0≤s<1. 
 
     
     
       7. An optical communication transmitter, comprising a light emitting unit and an optical communication drive circuit, wherein the optical communication drive circuit comprises:
 a clock circuit, configured to output a clock signal with an initial frequency signal as an input under control of information to be transmitted, wherein the clock signal comprises alternating first and second frequency signals, the first frequency signal and the second frequency signal having different frequencies and being generated based on the initial frequency signal; and 
 a modulation circuit, configured to modulate an optical signal, generated by the light emitting unit, by the clock signal output by the clock circuit to obtain a modulated optical signal; and 
 the clock circuit comprises:
 a control sub-circuit, configured to generate a sequence of control words according to the information to be transmitted, wherein the sequence of control words comprises alternating first and second control words; and 
 a processing sub-circuit, configured to obtain the first frequency signal based on a frequency of the initial frequency signal and the first control word in the sequence of control words generated by the control sub-circuit, and obtain the second frequency signal based on the frequency of the initial frequency signal and the second control word in the sequence of control words generated by the control sub-circuit; wherein 
 the processing sub-circuit comprises:
 a frequency divider, configured to generate K signals having uniformly spaced phases according to the initial frequency signal, wherein K is an integer greater than 2; and 
 a frequency synthesizer, configured to generate the first frequency signal based on the K signals having uniformly spaced phases generated by the frequency divider and the first control word, and generate the second frequency signal based on the K signals having uniformly spaced phases and the second control word. 
 
 
 
     
     
       8. An optical communication system, comprising a transmitter and a receiver, wherein the transmitter is the optical communication transmitter as defined in  claim 7 . 
     
     
       9. A vehicle, comprising the optical communication transmitter as defined in  claim 7 . 
     
     
       10. An optical communication drive method, comprising:
 outputting a clock signal with an initial frequency signal as an input under control of information to be transmitted, wherein the clock signal comprises alternating first and second frequency signals, the first frequency signal and the second frequency signal having different frequencies and being generated based on the initial frequency signal; and 
 modulating an optical signal by the clock signal to obtain a modulated optical signal; 
 and outputting the clock signal with the initial frequency signal as the input under the control of the information to be transmitted comprises:
 generating a sequence of control words according to the information to be transmitted, wherein the sequence of control words comprises alternating first and second control words; and 
 obtaining the first frequency signal based on a frequency of the initial frequency signal and the first control word, and obtaining the second frequency signal based on the frequency of the initial frequency signal and the second control word; wherein 
 obtaining the first frequency signal based on the frequency of the initial frequency signal and the first control word, and obtaining the second frequency signal based on the frequency of the initial frequency signal and the second control word comprise:
 generating K signals having uniformly spaced phases according to the initial frequency signal, wherein K is an integer greater than 2; and 
 generating the first frequency signal based on the K signals having uniformly spaced phases and the first control word, and generating the second frequency signal based on the K signals having uniformly spaced phases and the second control word. 
 
 
 
     
     
       11. The method according to  claim 10 , wherein generating the sequence of control words according to the information to be transmitted comprises:
 sequentially selecting, based on a corresponding relationship between bits and control word, control words corresponding to respective bits in the information to be transmitted according to an order of the bits in the information to be transmitted, so as to obtain the sequence of control words. 
 
     
     
       12. The method according to  claim 11 , wherein before sequentially selecting, based on the corresponding relationship between the bits and the control words, the control words corresponding to the respective bits in the information to be transmitted according to the order of the bits in the information to be transmitted, generating the sequence of control words according to the information to be transmitted further comprises:
 selecting the corresponding relationship between the bits and the control words according to a communication mode, wherein the corresponding relationship between the bits and the control words is at least partially different in different communication modes. 
 
     
     
       13. The method according to  claim 10 , wherein generating the first frequency signal based on the K signals having uniformly spaced phases and the first control word, and generating the second frequency signal based on the K signals having uniformly spaced phases and the second control word comprise:
 generating a first periodic signal and a second periodic signal based on the K signals having uniformly spaced phases and the first control word, and further generating the first frequency signal based on the first periodic signal and the second periodic signal; and generating a third periodic signal and a fourth periodic signal based on the K signals having uniformly spaced phases and the second control word, and further generating the second frequency signal based on the third periodic signal and the fourth periodic signal. 
 
     
     
       14. The method according to  claim 13 , wherein generating the first periodic signal and the second periodic signal based on the K signals having uniformly spaced phases and the first control word, and generating the third periodic signal and the fourth periodic signal based on the K signals having uniformly spaced phases and the second control word comprise:
 generating the first periodic signal, the second periodic signal, the third periodic signal and the fourth periodic signal according to a formula as follows: 
 TA=I*Δ, TB=(I+1)*Δ, TC=J*Δ, TD=(J+1)*Δ, wherein Δ represents a phase difference between any two adjacent signals of the K signals having uniformly spaced phases, I represents an integer part in the first control word, J represents an integer part in the second control word, TA represents the first periodic signal, TB represents the second periodic signal, TC represents the third periodic signal, and TD represents the fourth periodic signal. 
 
     
     
       15. The method according to  claim 14 , wherein generating the first frequency signal based on the first periodic signal and the second periodic signal, and generating the second frequency signal based on the third periodic signal and the fourth periodic signal comprise:
 generating the first frequency signal and the second frequency signal according to a formula as follows:
     TTAF 1=(1− r )* TA+r*TB,TTAF 2=(1− s )* TC+s*TD,  
 
 
 wherein TTAF1 represents a period of the first frequency signal, r represents a decimal part in the first control word, with 0≤r<1, TTAF2 represents a period of the second frequency signal, and s represents a decimal part in the second control word, with 0≤s<1. 
 
     
     
       16. The method according to  claim 11 , wherein obtaining the first frequency signal based on the frequency of the initial frequency signal and the first control word, and obtaining the second frequency signal based on the frequency of the initial frequency signal and the second control word comprise:
 generating K signals having uniformly spaced phases according to the initial frequency signal, wherein K is an integer greater than 2; and 
 generating the first frequency signal based on the K signals having uniformly spaced phases and the first control word, and generating the second frequency signal based on the K signals having uniformly spaced phases and the second control word.